Replace Value type setters with mk* functions

Move clearValue inside Value

mkInt instead of setInt

mkBool instead of setBool

mkString instead of setString

mkPath instead of setPath

mkNull instead of setNull

mkAttrs instead of setAttrs

mkList instead of setList*

mkThunk instead of setThunk

mkApp instead of setApp

mkLambda instead of setLambda

mkBlackhole instead of setBlackhole

mkPrimOp instead of setPrimOp

mkPrimOpApp instead of setPrimOpApp

mkExternal instead of setExternal

mkFloat instead of setFloat

Add note that the static mk* function should be removed eventually

src/libexpr/attr-set.cc

@@ -24,9 +24,7 @@ void EvalState::mkAttrs(Value & v, size_t capacity)
         v = vEmptySet;
         return;
     }
-    clearValue(v);
+    v.mkAttrs(allocBindings(capacity));
-    v.setAttrs();
-    v.attrs = allocBindings(capacity);
     nrAttrsets++;
     nrAttrsInAttrsets += capacity;
 }

src/libexpr/eval-inline.hh

@@ -36,13 +36,11 @@ void EvalState::forceValue(Value & v, const Pos & pos)
         Env * env = v.thunk.env;
         Expr * expr = v.thunk.expr;
         try {
-            v.setBlackhole();
+            v.mkBlackhole();
             //checkInterrupt();
             expr->eval(*this, *env, v);
         } catch (...) {
-            v.setThunk();
+            v.mkThunk(env, expr);
-            v.thunk.env = env;
-            v.thunk.expr = expr;
             throw;
         }
     }

src/libexpr/eval.cc

@@ -430,9 +430,7 @@ EvalState::EvalState(const Strings & _searchPath, ref<Store> store)
         }
     }
 
-    clearValue(vEmptySet);
+    vEmptySet.mkAttrs(allocBindings(0));
-    vEmptySet.setAttrs();
-    vEmptySet.attrs = allocBindings(0);
 
     createBaseEnv();
 }
@@ -548,16 +546,14 @@ Value * EvalState::addPrimOp(const string & name,
        the primop to a dummy value. */
     if (arity == 0) {
         auto vPrimOp = allocValue();
-        vPrimOp->setPrimOp();
+        vPrimOp->mkPrimOp(new PrimOp { .fun = primOp, .arity = 1, .name = sym });
-        vPrimOp->primOp = new PrimOp { .fun = primOp, .arity = 1, .name = sym };
         Value v;
         mkApp(v, *vPrimOp, *vPrimOp);
         return addConstant(name, v);
     }
 
     Value * v = allocValue();
-    v->setPrimOp();
+    v->mkPrimOp(new PrimOp { .fun = primOp, .arity = arity, .name = sym });
-    v->primOp = new PrimOp { .fun = primOp, .arity = arity, .name = sym };
     staticBaseEnv.vars[symbols.create(name)] = baseEnvDispl;
     baseEnv.values[baseEnvDispl++] = v;
     baseEnv.values[0]->attrs->push_back(Attr(sym, v));
@@ -572,8 +568,7 @@ Value * EvalState::addPrimOp(PrimOp && primOp)
     if (primOp.arity == 0) {
         primOp.arity = 1;
         auto vPrimOp = allocValue();
-        vPrimOp->setPrimOp();
+        vPrimOp->mkPrimOp(new PrimOp(std::move(primOp)));
-        vPrimOp->primOp = new PrimOp(std::move(primOp));
         Value v;
         mkApp(v, *vPrimOp, *vPrimOp);
         return addConstant(primOp.name, v);
@@ -584,8 +579,7 @@ Value * EvalState::addPrimOp(PrimOp && primOp)
         primOp.name = symbols.create(std::string(primOp.name, 2));
 
     Value * v = allocValue();
-    v->setPrimOp();
+    v->mkPrimOp(new PrimOp(std::move(primOp)));
-    v->primOp = new PrimOp(std::move(primOp));
     staticBaseEnv.vars[envName] = baseEnvDispl;
     baseEnv.values[baseEnvDispl++] = v;
     baseEnv.values[0]->attrs->push_back(Attr(primOp.name, v));
@@ -708,15 +702,13 @@ LocalNoInline(void addErrorTrace(Error & e, const Pos & pos, const char * s, con
 
 void mkString(Value & v, const char * s)
 {
-    mkStringNoCopy(v, dupString(s));
+    v.mkString(dupString(s));
 }
 
 
 Value & mkString(Value & v, std::string_view s, const PathSet & context)
 {
-    v.setString();
+    v.mkString(dupStringWithLen(s.data(), s.size()));
-    v.string.s = dupStringWithLen(s.data(), s.size());
-    v.string.context = 0;
     if (!context.empty()) {
         size_t n = 0;
         v.string.context = (const char * *)
@@ -731,7 +723,7 @@ Value & mkString(Value & v, std::string_view s, const PathSet & context)
 
 void mkPath(Value & v, const char * s)
 {
-    mkPathNoCopy(v, dupString(s));
+    v.mkPath(dupString(s));
 }
 
 
@@ -792,16 +784,9 @@ Env & EvalState::allocEnv(size_t size)
 
 void EvalState::mkList(Value & v, size_t size)
 {
-    clearValue(v);
+    v.mkList(size);
-    if (size == 1)
+    if (size > 2)
-        v.setList1();
+        v.bigList.elems = (Value * *) allocBytes(size * sizeof(Value *));
-    else if (size == 2)
-        v.setList2();
-    else {
-        v.setListN();
-        v.bigList.size = size;
-        v.bigList.elems = size ? (Value * *) allocBytes(size * sizeof(Value *)) : 0;
-    }
     nrListElems += size;
 }
 
@@ -810,9 +795,7 @@ unsigned long nrThunks = 0;
 
 static inline void mkThunk(Value & v, Env & env, Expr * expr)
 {
-    v.setThunk();
+    v.mkThunk(&env, expr);
-    v.thunk.env = &env;
-    v.thunk.expr = expr;
     nrThunks++;
 }
 
@@ -1207,9 +1190,7 @@ void ExprOpHasAttr::eval(EvalState & state, Env & env, Value & v)
 
 void ExprLambda::eval(EvalState & state, Env & env, Value & v)
 {
-    v.setLambda();
+    v.mkLambda(&env, this);
-    v.lambda.env = &env;
-    v.lambda.fun = this;
 }
 
 
@@ -1252,9 +1233,7 @@ void EvalState::callPrimOp(Value & fun, Value & arg, Value & v, const Pos & pos)
     } else {
         Value * fun2 = allocValue();
         *fun2 = fun;
-        v.setPrimOpApp();
+        v.mkPrimOpApp(fun2, &arg);
-        v.primOpApp.left = fun2;
-        v.primOpApp.right = &arg;
     }
 }
 

src/libexpr/nixexpr.hh

@@ -129,7 +129,7 @@ struct ExprPath : Expr
 {
     string s;
     Value v;
-    ExprPath(const string & s) : s(s) { mkPathNoCopy(v, this->s.c_str()); };
+    ExprPath(const string & s) : s(s) { v.mkPath(this->s.c_str()); };
     COMMON_METHODS
     Value * maybeThunk(EvalState & state, Env & env);
 };

src/libexpr/primops.cc

@@ -1434,7 +1434,7 @@ static void prim_readDir(EvalState & state, const Pos & pos, Value * * args, Val
         Value * ent_val = state.allocAttr(v, state.symbols.create(ent.name));
         if (ent.type == DT_UNKNOWN)
             ent.type = getFileType(path + "/" + ent.name);
-        mkStringNoCopy(*ent_val,
+        ent_val->mkString(
             ent.type == DT_REG ? "regular" :
             ent.type == DT_DIR ? "directory" :
             ent.type == DT_LNK ? "symlink" :

src/libexpr/value.hh

@@ -114,24 +114,6 @@ friend void printValue(std::ostream & str, std::set<const Value *> & active, con
 
 public:
 
-    inline void setInt() { internalType = tInt; };
-    inline void setBool() { internalType = tBool; };
-    inline void setString() { internalType = tString; };
-    inline void setPath() { internalType = tPath; };
-    inline void setNull() { internalType = tNull; };
-    inline void setAttrs() { internalType = tAttrs; };
-    inline void setList1() { internalType = tList1; };
-    inline void setList2() { internalType = tList2; };
-    inline void setListN() { internalType = tListN; };
-    inline void setThunk() { internalType = tThunk; };
-    inline void setApp() { internalType = tApp; };
-    inline void setLambda() { internalType = tLambda; };
-    inline void setBlackhole() { internalType = tBlackhole; };
-    inline void setPrimOp() { internalType = tPrimOp; };
-    inline void setPrimOpApp() { internalType = tPrimOpApp; };
-    inline void setExternal() { internalType = tExternal; };
-    inline void setFloat() { internalType = tFloat; };
-
     // Functions needed to distinguish the type
     // These should be removed eventually, by putting the functionality that's
     // needed by callers into methods of this type
@@ -222,6 +204,123 @@ public:
         abort();
     }
 
+    /* After overwriting an app node, be sure to clear pointers in the
+       Value to ensure that the target isn't kept alive unnecessarily. */
+    inline void clearValue()
+    {
+        app.left = app.right = 0;
+    }
+
+    inline void mkInt(NixInt n)
+    {
+        clearValue();
+        internalType = tInt;
+        integer = n;
+    }
+
+    inline void mkBool(bool b)
+    {
+        clearValue();
+        internalType = tBool;
+        boolean = b;
+    }
+
+    inline void mkString(const char * s, const char * * context = 0)
+    {
+        internalType = tString;
+        string.s = s;
+        string.context = context;
+    }
+
+    inline void mkPath(const char * s)
+    {
+        clearValue();
+        internalType = tPath;
+        path = s;
+    }
+
+    inline void mkNull()
+    {
+        clearValue();
+        internalType = tNull;
+    }
+
+    inline void mkAttrs(Bindings * a)
+    {
+        clearValue();
+        internalType = tAttrs;
+        attrs = a;
+    }
+
+    inline void mkList(size_t size)
+    {
+        clearValue();
+        if (size == 1)
+            internalType = tList1;
+        else if (size == 2)
+            internalType = tList2;
+        else {
+            internalType = tListN;
+            bigList.size = size;
+        }
+    }
+
+    inline void mkThunk(Env * e, Expr * ex)
+    {
+        internalType = tThunk;
+        thunk.env = e;
+        thunk.expr = ex;
+    }
+
+    inline void mkApp(Value * l, Value * r)
+    {
+        internalType = tApp;
+        app.left = l;
+        app.right = r;
+    }
+
+    inline void mkLambda(Env * e, ExprLambda * f)
+    {
+        internalType = tLambda;
+        lambda.env = e;
+        lambda.fun = f;
+    }
+
+    inline void mkBlackhole()
+    {
+        internalType = tBlackhole;
+        // Value will be overridden anyways
+    }
+
+    inline void mkPrimOp(PrimOp * p)
+    {
+        clearValue();
+        internalType = tPrimOp;
+        primOp = p;
+    }
+
+
+    inline void mkPrimOpApp(Value * l, Value * r)
+    {
+        internalType = tPrimOpApp;
+        app.left = l;
+        app.right = r;
+    }
+
+    inline void mkExternal(ExternalValueBase * e)
+    {
+        clearValue();
+        internalType = tExternal;
+        external = e;
+    }
+
+    inline void mkFloat(NixFloat n)
+    {
+        clearValue();
+        internalType = tFloat;
+        fpoint = n;
+    }
+
     bool isList() const
     {
         return internalType == tList1 || internalType == tList2 || internalType == tListN;
@@ -251,86 +350,42 @@ public:
 };
 
 
-/* After overwriting an app node, be sure to clear pointers in the
-   Value to ensure that the target isn't kept alive unnecessarily. */
-static inline void clearValue(Value & v)
-{
-    v.app.left = v.app.right = 0;
-}
-
 
+// TODO: Remove these static functions, replace call sites with v.mk* instead
 static inline void mkInt(Value & v, NixInt n)
 {
-    clearValue(v);
+    v.mkInt(n);
-    v.setInt();
-    v.integer = n;
 }
 
-
 static inline void mkFloat(Value & v, NixFloat n)
 {
-    clearValue(v);
+    v.mkFloat(n);
-    v.setFloat();
-    v.fpoint = n;
 }
 
-
 static inline void mkBool(Value & v, bool b)
 {
-    clearValue(v);
+    v.mkBool(b);
-    v.setBool();
-    v.boolean = b;
 }
 
-
 static inline void mkNull(Value & v)
 {
-    clearValue(v);
+    v.mkNull();
-    v.setNull();
 }
 
-
 static inline void mkApp(Value & v, Value & left, Value & right)
 {
-    v.setApp();
+    v.mkApp(&left, &right);
-    v.app.left = &left;
-    v.app.right = &right;
 }
 
-
-static inline void mkPrimOpApp(Value & v, Value & left, Value & right)
-{
-    v.setPrimOpApp();
-    v.app.left = &left;
-    v.app.right = &right;
-}
-
-
-static inline void mkStringNoCopy(Value & v, const char * s)
-{
-    v.setString();
-    v.string.s = s;
-    v.string.context = 0;
-}
-
-
 static inline void mkString(Value & v, const Symbol & s)
 {
-    mkStringNoCopy(v, ((const string &) s).c_str());
+    v.mkString(((const string &) s).c_str());
 }
 
 
 void mkString(Value & v, const char * s);
 
 
-static inline void mkPathNoCopy(Value & v, const char * s)
-{
-    clearValue(v);
-    v.setPath();
-    v.path = s;
-}
-
-
 void mkPath(Value & v, const char * s);
 
 

src/nix/repl.cc

@@ -551,9 +551,7 @@ bool NixRepl::processLine(string line)
         {
             Expr * e = parseString(string(line, p + 1));
             Value & v(*state->allocValue());
-            v.setThunk();
+            v.mkThunk(env, e);
-            v.thunk.env = env;
-            v.thunk.expr = e;
             addVarToScope(state->symbols.create(name), v);
         } else {
             Value v;